Hi there! I’m Frank. I understand that in Plex Dash on your Mac running OS X 10.15.7, you’re not able to see your libraries or the "most listened" stats. Let’s narrow down the issue to get you back up and running.

First, could you tell me if this problem started recently? Also, have you tried any troubleshooting steps yet, such as restarting the app or your Plex Media Server?

Meanwhile, here’s a step-by-step approach we can try:

1. Clear Cache on Plex Dash App: Sometimes cached data can cause display issues. Since you're on macOS, try quitting the Plex Dash app completely, then relaunch it to refresh it.

2. Check Plex Media Server Connectivity:
- Make sure your Plex Media Server is up and running. Try accessing it via a browser on the same machine by going to http://localhost:32400/web.
- Verify that the server shows your libraries correctly there.

3. Sign Out and Sign Back In: Logging out and back in on the Plex Dash app ensures your session is refreshed and any token/authorization glitches are fixed.

4. Restart Your Plex Media Server: Sometimes a restart resolves sync issues between the server and Plex Dash.

5. Verify Library Visibility: Within your Plex Media Server settings, check that the libraries are enabled and shared with your Plex account, especially if you use managed or shared accounts.

6. Check for Updates:
- Ensure both your Plex Media Server and Plex Dash app are up to date, as outdated versions sometimes fail to display correct information.

If after these steps, libraries or most listened stats still don’t show, there might be an issue with data synchronization or the Plex Dash app’s cache1.

Could you please try these and let me know if any step changes the situation? If needed, I can guide you through clearing cache manually or checking log files for errors.

Are you ready to start from step one, or have you already tried some of these?